Using a variable in an if/for/do-while block in php -

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If I'm not mistaken, then I used a new statement or new PHP variable for the first time in a conditional loop block. What I want to say is like the following. 

  & lt; For php ($ i = 0; $ i & lt; 10, $ i ++) {$ total + = $ i; $ Concat = $ I; }? & Gt;   
 But today, when I look at the error log, it says that $ total and $ concet are undefined variables then I write this  
  $ Total = 0; $ Concat = ""; ($ I = 0; $ i & lt; 10; $ i ++) for {$ total + = $ i; $ Concat = $ I; }? & Gt;   
 Why does it work with an error? Only ask for curiosity   
 
 
 The reason for this is:  
  $ Total + = $ i; $ Concat = $ I;   
 In fact it means:    $ total = $ total + $ i; $ Concat = $ concat $ I;   
 The first time you execute the loop, you get an error if  $ total  and  $ concat  are undefined.  
  More details:   
 During the first part of the loop, you  
  total $ = undefined $ total + $ The value of i;   
 Now, the total has been defined for $ concat also.

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